The shapes of methane,ethene and ethyne molecules are,respectively

Fill in the blanks:
$(i)$ Based on the type of overlapping,covalent bonds are classified into ........ and .......... .
$(ii)$ The bond formation involving hybrid orbitals is called ............. .
$(iii)$ The type of hybridization observed in the $C_2H_6$ molecule is ........... .
$(iv)$ The type of hybridization observed in the $BrF_5$ complex is ............... .

In the acetylene molecule,the $C-H$ sigma bond is formed by the overlap of which orbitals?

Explain $sp^3d^2$ hybridization with a suitable example.

Explain the bond formation by $sp$ orbitals.

For which of the following hybridisation is the bond angle maximum?